Routing The Suction Line And Strainer; Connecting The Sampler To External Devices - Teledyne 4700 Pocket Manual

2.6 Routing the Suction Line and
Strainer
Route the suction line so that it has a
continuous slope from the liquid source to the
sampler. This helps to drain the line during
pre- and post-sample line rinses. If a suction
line exposed to freezing climates does not fully
drain, there is a risk of liquid in the suction line
becoming frozen. Frozen liquid will cause the
sample collection to fail. A warm sampling
source can usually prevent this, provided there
are no loops in the suction line. Some extreme
situations may require more protective
measures, such as insulating the suction line,
or applying heat tape.
For representative samples, place the strainer
in the main current of the flow stream, not in
an eddy or at the edge of flow. Placing a strainer
at the bottom may produce samples with excess
heavy solids and no floating materials, while
placing it at the top may produce the opposite
conditions.
2.7 Connecting the Sampler to
External Devices
You can connect the sampler to an external
instrument (Figure 2-10) for a variety of
reasons. Typical reasons include:
• Receiving flow pulses from a flow meter
device for variable time or variable
volume sample collection.
Section 2 Installation
2-23